The answer is that electric cars have a very high energy efficiency. They run virtually silently with minimal moving parts. 95% of the energy turns the wheels. Your average petrol/gas guzzling car/truck/bus puts about 25 to 30% of its energy to turn the wheels – the rest spews out as noise and heat and fumes to give you lung cancer.

The more the grid turns to renewables or nuclear – the less greenhouse as well. But mile for mile an electric car is almost a factor of 10 cleaner for the environment than a petrol car even from a coal based grid.